.page-about {
  display: block;
  color: var(--text);
  background: var(--ink-900);
  overflow-x: hidden;
}

.page-about .container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.page-about .breadcrumb-list li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  display: inline-block;
  margin: 0 10px;
  color: var(--sage);
}

.page-about .breadcrumb-link {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .breadcrumb-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 5vw, 58px) 0 clamp(40px, 7vw, 88px);
  border-bottom: var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(43, 227, 199, 0.1), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 107, 44, 0.06), transparent 70%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 34px;
  background-image: repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 26px);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 48px);
  align-items: start;
}

.page-about .meta-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 2px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

.page-about .btn-primary {
  background: var(--cyan);
  color: var(--ink-900);
}

.page-about .btn-primary:hover {
  background: var(--cyan-deep);
  color: var(--text);
}

.page-about .btn-ghost {
  background: transparent;
  border-color: var(--grid-line);
  color: var(--text);
}

.page-about .btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* 首屏数据面板 */
.page-about .about-hero-panel {
  position: relative;
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink-800);
  border: var(--line);
}

.page-about .about-hero-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 2px;
  background: var(--cyan);
}

.page-about .panel-head {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .label-mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-about .panel-stats {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .panel-stats li {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 15px 0;
  border-bottom: var(--line);
}

.page-about .panel-stats li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .p-num {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(36px, 6vw, 50px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .p-num small {
  font-size: 0.5em;
  margin-left: 2px;
}

.page-about .p-num--orange {
  color: var(--orange);
}

.page-about .p-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .p-label {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.45;
  color: var(--text);
}

.page-about .p-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sage);
}

/* ---------- 章节导航 ---------- */
.page-about .about-index {
  background: var(--ink-800);
  border-bottom: var(--line);
}

.page-about .about-index-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-block: 12px;
}

.page-about .about-index-label {
  flex: none;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .about-index-list {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 2px 4px 4px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  white-space: nowrap;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-2);
  text-decoration: none;
  transition: transform 0.16s var(--ease), border-color 0.16s var(--ease), color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .about-index-link:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: rgba(43, 227, 199, 0.08);
  color: var(--text);
}

.page-about .about-index-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(46px, 8vw, 92px) 0;
  border-bottom: var(--line);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 6px 16px;
  padding-bottom: 14px;
  border-bottom: var(--line);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .section-num {
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.25;
  color: var(--text);
}

.page-about .section-kicker {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-copy p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-intro {
  margin: 0 0 clamp(22px, 3.5vw, 34px);
  max-width: 68ch;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-note {
  margin: clamp(22px, 3.5vw, 32px) 0 0;
  padding-top: 16px;
  border-top: var(--line);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-2);
}

.page-about .inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 199, 0.45);
  transition: border-color 0.16s var(--ease);
}

.page-about .inline-link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 栅格 ---------- */
.page-about .grid-12 {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--ink-800);
  border: var(--line);
}

.page-about .media-frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(43, 227, 199, 0.22);
  pointer-events: none;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: 0 0 0 32px;
  list-style: none;
  border-left: 1px solid var(--grid-line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 34px);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-node {
  position: absolute;
  left: -38px;
  top: 8px;
  box-sizing: border-box;
  width: 12px;
  height: 12px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
  transition: background 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .tl-item:hover .tl-node {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 227, 199, 0.18);
}

.page-about .tl-card {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--ink-800);
  border: var(--line);
  border-left: 2px solid var(--grid-line);
  transition: transform 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .tl-item:hover .tl-card {
  transform: translateX(2px);
  border-left-color: var(--cyan);
  background: var(--ink-700);
}

.page-about .tl-season {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .tl-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .tl-note {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--sage);
}

/* ---------- 02 服务方向 ---------- */
.page-about .svc {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink-800);
  border: var(--line);
  transition: transform 0.16s var(--ease), border-color 0.16s var(--ease), background 0.16s var(--ease);
}

.page-about .svc:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--ink-700);
}

.page-about .svc--lead {
  background:
    linear-gradient(150deg, rgba(43, 227, 199, 0.13), rgba(16, 31, 51, 0.92) 46%),
    var(--ink-800);
  border-color: rgba(43, 227, 199, 0.36);
}

.page-about .svc-num {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .svc-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--text);
}

.page-about .svc-text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .svc-meta {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: var(--line);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 03 数据能力统计带 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--grid-line);
  border: var(--line);
}

.page-about .about-stats li {
  padding: clamp(16px, 2.4vw, 22px);
  background: var(--ink-800);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .stat-num--orange {
  color: var(--orange);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-2);
}

/* ---------- 04 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid-line);
  border: var(--line);
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ink-800);
  transition: background 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .team-card:hover {
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-about .team-idx {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .team-name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .team-desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-2);
}

.page-about .team-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: auto 0 0;
  padding-top: 6px;
  opacity: 0.6;
  transition: opacity 0.18s var(--ease);
}

.page-about .team-card:hover .team-tags {
  opacity: 1;
}

.page-about .tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.page-about .tag--cyan {
  border-color: rgba(43, 227, 199, 0.5);
  color: var(--cyan);
}

/* ---------- 05 用户与语言 ---------- */
.page-about .reach-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border: var(--line);
  background: var(--ink-800);
}

.page-about .reach-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px clamp(16px, 2.4vw, 20px);
  border-bottom: var(--line);
}

.page-about .reach-list li:last-child {
  border-bottom: 0;
}

.page-about .reach-key {
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .reach-val {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-reach-media {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 06 投入方向 ---------- */
.page-about .next-panel {
  padding: clamp(20px, 3vw, 28px);
  background:
    linear-gradient(160deg, rgba(255, 107, 44, 0.12), rgba(16, 31, 51, 0.94) 52%),
    var(--ink-800);
  border: var(--line);
  border-top: 2px solid var(--orange);
}

.page-about .next-head {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .next-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .next-list li + li {
  border-top: var(--line);
}

.page-about .next-link {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  text-decoration: none;
  transition: color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .next-link:hover {
  color: var(--cyan);
  transform: translateX(2px);
}

.page-about .next-link .arrow {
  flex: none;
  font-family: var(--font-mono);
  color: var(--orange);
  transition: color 0.16s var(--ease);
}

.page-about .next-link:hover .arrow {
  color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .grid-12 {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: clamp(18px, 2.2vw, 28px);
  }

  .page-about .col-4 {
    grid-column: span 4;
  }

  .page-about .col-5 {
    grid-column: span 5;
  }

  .page-about .col-6 {
    grid-column: span 6;
  }

  .page-about .col-7 {
    grid-column: span 7;
  }

  .page-about .col-8 {
    grid-column: span 8;
  }

  .page-about .section-head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: baseline;
  }

  .page-about .section-kicker {
    grid-column: auto;
    justify-self: end;
    text-align: right;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-grid {
    grid-template-columns: 1.35fr 1fr 1.2fr 0.95fr;
  }

  .page-about .reach-list li {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .tl-item:nth-child(odd) .tl-card {
    max-width: 660px;
  }

  .page-about .tl-item:nth-child(even) .tl-card {
    max-width: 540px;
    margin-left: clamp(0px, 9%, 130px);
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .tl-note {
    overflow: hidden;
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height 0.26s var(--ease), opacity 0.2s var(--ease), margin-top 0.26s var(--ease);
  }

  .page-about .tl-item:hover .tl-note,
  .page-about .tl-item:focus-within .tl-note {
    max-height: 140px;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn,
  .page-about .svc,
  .page-about .team-card,
  .page-about .tl-card,
  .page-about .tl-note,
  .page-about .next-link,
  .page-about .about-index-link {
    transition: none;
  }
}